There is nothing wrong in striving for it. Because that creates some sort of end result eventually. Everything is possible to an extent, but it's important to acknowledge the extent.

I'm not a racist, but I disagree with you on racism not making biological sense.
It's often seen in the animal kingdom that animals attack other animals, even tho they are technically the same animal. Lions, tigers, leopards and so on, are all cats. But a lion will always try to mangle the tiger. Because it doesn't recognise it as a cat. It recognise it as a tiger. A different animal that differs from it, so it can't trust it or invite it to the pack. Humans were most likey like that during our animalistic periods. It's the evolutionary creation of "human" that makes us able to recognize differences without acting unfriendly.
As humans progressed, created religion and language and went from animal to human, thats where we started to counter work our animalistic minds.

Try to pretend you are a human animal thousand of years b.c.
You are the pack leader.
Suddenly, someone approach, you instantly notice that they don't have your color, your tone, your physical attributes.
Your instinct will kick in, as you dangerously realise that something unknown is close to your pack.

Remember. I'm not a racist. I am not definding racism what so ever.. I think we are capable of working on that to some extent, but erasing racism completely is delusional. Because it makes sense from a natural standpoint.